On Mon, 28 Nov 2005 22:05:38 -0600, email@example.com
>I got a 1979 F150 with a 400 engine. 4WD pickup.
>The transmission is a C6. I am hoing to change the filter and fluid.
>I am getting conflicting stories from local parts stores. Do I need
>type F fluid, or can I use Mercon III ?
Ford change the clutch disc and fluid spec after the 1976
model year. If the trans is a 1977 up, it should use the
Dexron/Mercon spec fluid. You should also find this on the
dipstick. The current version of this is the Dexron
III/Mercon spec. Do not use the Mercon V spec in the C6.